Your local regulations could state boiler water above 43 °C must not be discharged into the drain.
ALWAYS check your local regulations.
Boilers with manual blowdown valves
1.
A low-level drain point is required in the blowdown pipework between the boiler and the Blow
Down Vessel for both manual and automatic blowdown systems.
2.
The boiler should not be under pressure/the boiler should be cold.
3.
Isolate the boiler electrics at the isolator on the control box door.
4.
Isolate the feedwater tank and the feedwater pumps.
5.
Open the main steam valve and the boiler blowdown valve.
6.
Open the blowdown vessel drain valve.
7.
Open all valves in the drain lines.
(Skid Units/Plant Rooms, have internal drainage systems which require the same procedures).
Boilers with automatic blowdown systems
1.
The boiler should not be under pressure/the boiler should be cold.
2.
Open the main blowdown valve.
3.
Using the blowdown bypass valve to throttle the flow, drain the boiler.
Note: Skid units and plant rooms have internal drainage systems which require the same procedures.
If a blowdown bypass valve is not fitted then you can manually blowdown the boiler by using a
flat-head screwdriver. Locate manual blowdown button (labelled as A in Figure. 17), push the
Manual Blowdown Button up and make a quarter turn clockwise, this will lock the button in
position and open the blowdown valve.
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